package com.heima.app.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;

/**
 * @program: heima-leadnews
 * @description: 全局过滤器
 * @author: ryp
 * @create: 2023-04-23 17:18
 **/
@Slf4j
@Component
public class AuthFilter implements Ordered, GlobalFilter {

    private static final ArrayList<String> RELEASE_URL = new ArrayList(Arrays.asList("/user/api/v1/login/login_auth/"));

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.判断请求路径是否需要拦截
        ServerHttpRequest request = exchange.getRequest();
        URI uri = request.getURI();
        ServerHttpResponse response = exchange.getResponse();
        //2.不需要则直接放行
        if (RELEASE_URL.indexOf(uri.getPath()) > -1) {
            return chain.filter(exchange);
        }
        //3.需要则 获取请求中的令牌
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isEmpty(token)) {
            //4.令牌不存在，则返回友好错误提示
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5. 令牌存在，解析令牌，解析失败-篡改，过期，伪造，返回友好提示信息
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int verifyToken = AppJwtUtil.verifyToken(claimsBody);
        if (verifyToken > 0) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //6. 解析成功，把用户id信息存入请求头，放行请求（为了提高代码复用率，不用每个微服务都去解析jwt令牌）
        String id = String.valueOf(claimsBody.get("id"));
        //String id = (String) claimsBody.get("id");
        request.mutate().header("id", id);
        return chain.filter(exchange);
    }

    /**
     * 功能描述: 优先级设置  值越小  优先级越高
     *
     * @return : int
     */
    @Override
    public int getOrder() {
        return 1;
    }
}
